Poco::RegularExpression

Posted by Setsu on June 16, 2010 Leave a comment (1) Go to comments

その名の通り正規表現を扱うクラスで、Philip Hazel さん作の PCRE という Perl コンパチブルな正規表現ライブラリを使って実装されています。 (http://www.pcre.org).

RegularExpressionTest.cpp

・正規表現そのものを解説してもしょうがないので何を作ろうか迷ったのですが、
　Poco::RegularExpression のページのソースからキーワードを抽出して、Cross Reference のページの
　ような表を作る（HTML ファイルを吐き出す）ことにしました。
・まず “<a name=\”[0-9]+\”>[A-Za-z]+</a>” で切り出して、その文字列から “[0-9]+” で番号を、
　”[A-Za-z]+” で method/enum 名を抽出してハイパーリンクを作成。
・それに続く説明文を “(description\”>\n<p>)(.*)(</p>)” で抜き出し。

#include <Poco/Format.h>
#include <Poco/Net/HTTPStreamFactory.h>
#include <Poco/FileStream.h>
#include <Poco/StreamCopier.h>
#include <Poco/URI.h>
#include <Poco/URIStreamOpener.h>
#include <Poco/RegularExpression.h>
#include <Poco/String.h>
 
#include <string>
#include <sstream>
 
#include "ScopedLogMessage.h"
#include "PrepareConsoleLogger.h"
 
const char* kOutputFileName = "RegularExpression.html";
const char* kSourceFileName = "http://pocoproject.org/docs/Poco.RegularExpression.html";
 
const char* LeadingHTML =
	"<!DOCTYPE html PUBLIC '-//W3C//DTD XHTML 1.0 Transitional//EN' 'http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd'>\n"
	"<html xmlns='http://www.w3.org/1999/xhtml'>\n"
	"<head>\n"
	"<title>Class Poco::RegularExpression</title>\n"
	"</head>\n"
	"<body>\n"
	"<table border='1'>\n"
	"<th>Method/Enumeration</th><th>Description</th>\n";
 
const char* TrailingHTML =
	"</table>\n"
	"</body>\n";
 
int main(int /*argc*/, char** /*argv*/)
{
	PrepareConsoleLogger logger(Poco::Logger::ROOT, Poco::Message::PRIO_INFORMATION);
 
	ScopedLogMessage msg("RegularExpressionTest ", "start", "end");
 
	{
		Poco::FileOutputStream ostr(kOutputFileName);
 
		ostr << LeadingHTML;
 
		Poco::Net::HTTPStreamFactory::registerFactory();
		Poco::URI uri(kSourceFileName);
		try
		{
			std::auto_ptr<std::istream> pStr(Poco::URIStreamOpener::defaultOpener().open(uri));
			std::stringstream ss;
			Poco::StreamCopier::copyStream(*pStr.get(), ss);
 
			msg.Message(Poco::format(" Finding out methods/enumerations from \"%s\".", std::string(kSourceFileName)));
			Poco::RegularExpression re("<a name=\"[0-9]+\">[A-Za-z]+</a>");
			Poco::RegularExpression::Match match;
			match.offset = 0;
			while(0 != re.match(ss.str(), match.offset, match))
			{
				std::string foundStr(ss.str().substr(match.offset, match.length));
 
				std::string numStr;
				Poco::RegularExpression re_num("[0-9]+");
				re_num.extract(foundStr, 0, numStr);
 
				std::string nameStr;
				Poco::RegularExpression re_name("[A-Za-z]+");
				re_name.extract(foundStr, std::strlen("<a name=\"\">")+numStr.length(), nameStr);
 
				msg.Message(Poco::format("  found \"%s\"", nameStr));
 
				ostr << "<tr><td><a href='" << uri.toString() << "#" << numStr << "' target='_blank'>"
					 << nameStr << "</a></td>";
 
				std::string descStr;
				Poco::RegularExpression re_desc("(description\">\n<p>)(.*)(</p>)");
				Poco::RegularExpression::Match match_desc;
				if(re_desc.match(ss.str(), match.offset, match_desc))
				{
					descStr = ss.str().substr(match_desc.offset, match_desc.length);
					re_desc.subst(descStr, "$2");
					Poco::replaceInPlace(descStr, "\"", "'");
					Poco::replaceInPlace(descStr, "href='Poco.", "href='http://pocoproject.org/docs/Poco.");
				}
				ostr << "<td>" << descStr << "</td></tr>" << std::endl;
 
				match.offset += match.length;
			}
		}
		catch(Poco::Exception& exc)
		{
			msg.Message(exc.displayText());
		}
 
		ostr << TrailingHTML;
	}
	msg.Message(Poco::format(" HTML file \"%s\" created.", std::string(kOutputFileName)));
 
	return 0;
}

#include <Poco/Format.h> #include <Poco/Net/HTTPStreamFactory.h> #include <Poco/FileStream.h> #include <Poco/StreamCopier.h> #include <Poco/URI.h> #include <Poco/URIStreamOpener.h> #include <Poco/RegularExpression.h> #include <Poco/String.h> #include <string> #include <sstream> #include "ScopedLogMessage.h" #include "PrepareConsoleLogger.h" const char* kOutputFileName = "RegularExpression.html"; const char* kSourceFileName = "http://pocoproject.org/docs/Poco.RegularExpression.html"; const char* LeadingHTML = "<!DOCTYPE html PUBLIC '-//W3C//DTD XHTML 1.0 Transitional//EN' 'http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd'>\n" "<html xmlns='http://www.w3.org/1999/xhtml'>\n" "<head>\n" "<title>Class Poco::RegularExpression</title>\n" "</head>\n" "<body>\n" "<table border='1'>\n" "<th>Method/Enumeration</th><th>Description</th>\n"; const char* TrailingHTML = "</table>\n" "</body>\n"; int main(int /*argc*/, char** /*argv*/) { PrepareConsoleLogger logger(Poco::Logger::ROOT, Poco::Message::PRIO_INFORMATION); ScopedLogMessage msg("RegularExpressionTest ", "start", "end"); { Poco::FileOutputStream ostr(kOutputFileName); ostr << LeadingHTML; Poco::Net::HTTPStreamFactory::registerFactory(); Poco::URI uri(kSourceFileName); try { std::auto_ptr<std::istream> pStr(Poco::URIStreamOpener::defaultOpener().open(uri)); std::stringstream ss; Poco::StreamCopier::copyStream(*pStr.get(), ss); msg.Message(Poco::format(" Finding out methods/enumerations from \"%s\".", std::string(kSourceFileName))); Poco::RegularExpression re("<a name=\"[0-9]+\">[A-Za-z]+</a>"); Poco::RegularExpression::Match match; match.offset = 0; while(0 != re.match(ss.str(), match.offset, match)) { std::string foundStr(ss.str().substr(match.offset, match.length)); std::string numStr; Poco::RegularExpression re_num("[0-9]+"); re_num.extract(foundStr, 0, numStr); std::string nameStr; Poco::RegularExpression re_name("[A-Za-z]+"); re_name.extract(foundStr, std::strlen("<a name=\"\">")+numStr.length(), nameStr); msg.Message(Poco::format(" found \"%s\"", nameStr)); ostr << "<tr><td><a href='" << uri.toString() << "#" << numStr << "' target='_blank'>" << nameStr << "</a></td>"; std::string descStr; Poco::RegularExpression re_desc("(description\">\n<p>)(.*)(</p>)"); Poco::RegularExpression::Match match_desc; if(re_desc.match(ss.str(), match.offset, match_desc)) { descStr = ss.str().substr(match_desc.offset, match_desc.length); re_desc.subst(descStr, "$2"); Poco::replaceInPlace(descStr, "\"", "'"); Poco::replaceInPlace(descStr, "href='Poco.", "href='http://pocoproject.org/docs/Poco."); } ostr << "<td>" << descStr << "</td></tr>" << std::endl; match.offset += match.length; } } catch(Poco::Exception& exc) { msg.Message(exc.displayText()); } ostr << TrailingHTML; } msg.Message(Poco::format(" HTML file \"%s\" created.", std::string(kOutputFileName))); return 0; }

Results of execution

[0] RegularExpressionTest start
[0]  Finding out methods/enumerations from "http://pocoproject.org/docs/Poco.RegularExpression.html".
[0]   found "MatchVec"
[0]   found "Options"
[0]   found "RegularExpression"
[0]   found "extract"
[0]   found "extract"
[0]   found "match"
[0]   found "match"
[0]   found "match"
[0]   found "match"
[0]   found "match"
[0]   found "match"
[0]   found "split"
[0]   found "split"
[0]   found "subst"
[0]   found "subst"
[0]   found "substOne"
[0]  HTML file "RegularExpression.html" created.
[0] RegularExpressionTest end